Datasheet

bq24050

bq24052

bq24055

www.ti.com

SLUS940B –SEPTEMBER 2009–REVISED JUNE 2012

The battery detect routine is run when entering and exiting TTDM to verify if battery is present, or run all the time

if battery is missing and not in TTDM. On power-up, if battery voltage is greater than V

RCH

threshold, a battery

detect routine is run to determine if a battery is present.

The battery detect routine will be disabled while the IC is in TTDM or has a TS fault. See Figure 28 for the

Battery Detect Flow Diagram.

Refresh Threshold

After termination, if the OUT pin voltage drops to VRCH (100mV below regulation) then a new charge is initiated,

but the CHG pin remains at a high impedance (off).

Starting a Charge on a Full Battery

The termination threshold is raised by ≉14%, for the first minute of a charge cycle so if a full battery is removed

and reinserted or a new charge cycle is initiated, that the new charge terminates (less than 1 minute). Batteries

that have relaxed many hours may take several minutes to taper to the termination threshold and terminate

charge.